feat(message): include member data in `InteractionReference.user`

[shiftinv]

Summary

Previously, message.interaction.user was just a User; the d["interaction"]["member"] data present in MESSAGE_CREATE/_EDIT is now used to turn this into a User | Member instead.

Fairly old apidocs change, seems like it was missed back then: https://github.com/discord/discord-api-docs/commit/56cea9462fae6a9b6399e5224b090dc2b68a77e0

Checklist

• [x] If code changes were made, then they have been tested
  • [x] I have updated the documentation to reflect the changes
  • [x] I have formatted the code properly by running pdm lint
  • [x] I have type-checked the code by running pdm pyright
• [ ] This PR fixes an issue
• [x] This PR adds something new (e.g. new method or parameters)
• [ ] This PR is a breaking change (e.g. methods or parameters removed/renamed)
• [ ] This PR is not a code change (e.g. documentation, README, ...)